此函数不断抛出名称错误。 我以为它会抛出IO错误什么的。 相反，它告诉我，这个函数没有被定义，而对我来说，它显然是被定义的。

import os
from os import *

def Search_File(self, x):
        cur_dir = os.getcwd()
        while True:
            file_list = os.listdir(cur_dir)
            parent_dir = os.path.dirname(cur_dir)
            File_Path_Search = x
            if File_Path_Search in file_list:
                break
            if cur_dir == parent_dir:
                break
            else:
                cur_dir = parent_dir

y = Search_File(self, txtFile_Path_Search.text())

错误如下:

Traceback (most recent call last):
  File "/home/jacob/Documents/Python Inquiry YES∕NO Program/Inquiry.py", line 68, in Calculate
    y = Search_File(self, txtFile_Path_Search.text())
NameError: name 'Search_File' is not defined